Share-based Compensation (Summary Of Stock-Based Compensation Not Yet Recognized) (Schedule and Footnote) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based incentive awards [Member] | Liberty Global plc [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized	$ 155.5
Weighted average period remaining for expense recognition	2 years 3 months 18 days
Share-based incentive awards [Member] | Telenet [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized	13.4
Weighted average period remaining for expense recognition	2 years 3 months 18 days
Performance-based incentive awards [Member] | Liberty Global plc [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized	$ 125.0
Weighted average period remaining for expense recognition	2 years 1 month 6 days